Manufacture of coach-lamps and dies therefor



F. G. CANNON.

MANUFACTURE 0P OOAOH' LAMPS AND 1113s THEREFOR.-

Patented Feb. 28,1882,

UNITED STATES PATENT -0FFICE.

FRED C. CANNON, OF NEW HAVEN, CONNECTICUT.

MANUFACTURE OF COACH-LAMPS AND DIES THEREFOR.

SPECIFICATION forming part of Letters Patent No. 254,273, dated February 28, 1882.

Application filed October 5, 1881. (No model.)

To all whom it may concern Be it known that I, FRED C. CANNON, of

New Haven, in the county of New Haven and State of Connecticut, have invented a new Improvement in the Manufacture of Coach- Lamps and Dies Therefor; and I do hereby declare the following, when taken in connection with the accompanying drawings and the letters of reference marked thereon, to be a full, clear, and exact description of the same, and'which said drawings constitute part of this specification, and represent, in -Figure .1,an inside viewof a lamp-door complete; Fig. 2, vertical section of the same- Fig. 3, the blank from which the lining or reflector is made, having the concave center 6 formed therein; Fig. 4, vertical section of the same; Fig. 5, face view of the reflector or lining; Fig. 6,vertical section of thesame 5 Figs. 7 and 8, the two parts of the dies in perspective; Fig. 9, vertical section of the two parts as closed upon the blank to produce the finished reflector; Fig. 10, vertical section, and Fig. 11 face view to illustrate previous constructions.

This invention relates to an improvementin the manufacture of lamps which are attached section, and in which or represents the outside part of the door, and b the reflector, the reflector constructed with a flange, d, turned at right angles toward the door, and then secured to the door by solder. in such construction it is difficult to solder the reflector to the door without more or less disfiguring the surface of the door, because the reflector must be finished before it is attached to the door. Again, in'the construction of this reflector itis desirable, not to say essential, that the central part of the reflector should, present aconcave surface,as at e, while the surrounding surface should be convex. 1n shaping this reflector in dies, as it is usually done, they are more orless defaced, and many destroyed, because of the unavoidable puckering or wrinkling of the metal between the edge of the concave portion and the outer edge of the door, as seen in Fig. 10.

The object of my invention is to overcome these difficulties and produce a reflector which may be madecomplete. and perfect, and attached to the door or side of the lamp without solder, and so as to be readily removable therefrom should occasion require and it consists in the method of producing the reflector, as hereinafter described, and more particularly recited in the claims.

I first cut from sheet metal a blank of the required shape, the outline shown in Fig. 3. I then, by the well-known spinning operation, produce the concave center 0, leaving the surrounding portion of the metal flat, as seen in Fig. 4. The blankis somewhat larger than thereflecting-surface required, so that there may be an edge left around the reflector. I then subject the blank thus prepared to the operation of dies, as seen in Figs. 7,8, and 9.. The lower die, A, Fig. 8, has an opening, B, corresponding to the size of the exposed surface of the reflector. This die is preferably flat upon its surface, and guide-pins f are set relatively to the edge of the opening B, so that the blank laid thereon, as indicated in broken lines, will bein its proper relative position to the opening. The other or upper part of the die, C, is in size larger than the opening B, and so as to come down upon the surface of the die A within the pins, and on the under surface of the die is aprojection, D, slightly less in length and width than the opening B in the lower part, and made convex upon its surface to correspond to the surface of the reflector required outside of the center or concave portion. In the center of this convex projecting part D is a recess, E, corresponding in diameter to the concave part of the reflector, but of greater depth.

The blank as prepared in Fig. 4 is laid upon the die A, as seen in Fig. 8. Then the part C is brought down thereon, as seen in Fig. 9, which forces the blank downinto the recess B of the lower part until the part C strikes upon the edge of the blank. as seen in Fig. 9, producing not only the requisite convex surface and the size of the reflector or lining required, but also turning a flange, h, around the edge of the reflector projecting outward in a plane parallel with the plane of the reflector, as seen in Figs. 5, 6, and 9.

It should be stated that in order to produce perfect angles and corners the corners on the blank are first clipped, as seen in Fig. 3.

By this method of producing the reflectorthat is, first spinning the center, then striking up the outer portion, and grasping the blank around the edge-I prevent all possible wrinkling, and produce a reflector giving the most finished and perfect surface. At the same time the flange around the edge strengthens the reflector, so that it will not twist like the old reflector.

To applythe reflectorto thedoor, Iconstrnct the door with an inwardlyturned-over edge, 1, as seen in Fig. 2, on three sides, as seen in Fig. 1, leaving the third edge open. The turned over edge of the door is in such relation to the reflector that the flange h of the reflector will slide into that turned-over edge as seen in Fig.

2, and when so introduced is thereby firmly secured in its place without solder or other fastening than that given by the turned-over edge. At the same time the door itself is strengthened because of the turned-over edge.

I have described the invention as applied to the door of the lamp, because this is the usual part to which the reflector is attached; but it may be also attached to either side in the same manner, the side of the lamp to which it is to be attached being constructed with alike turned-over edge, or with achannel into which the flange of the reflector or lining, as it is sometimes called, may be introduced.

I have represented the reflector or lining square, as this is the usual shape for this class oflinings; but it may be made polygonal, where such shape is desired. In that case the part of the die A will have its recess and the part 0 its projection D correspondingly shaped.

I claim 1. The method herein described of making coach-lamp reflectors or linings, consisting in first spinning the center to produce the concave portion, then striking up the surrounding portion to produce the convex surface, and at the same time to form the projecting flange 71. around the edge of the reflector, substantially as described.

2. The dies for forming coach-lamp reflectors or linings, consisting of the part A, with a recess, B, therein, of the shape of the reflector required, combined with the part 0, having a projection D on its face to enter the recess B in the other part, with a cavity, E, in said projecting part D, the surrounding surface of the said part D eorrespondin g to the convex surface of the reflector or lining required; substantially as described.

FRED O. CANNON.

Witnesses JOHN E. EARLE, LILLIAN D. ROGERS. 

